Z.D. January 24, 2011 Math 7B A) It takes about 100 maple trees to make 25 gallons of maple syrup. Mr. Paulo made maple syrup from all of his sugar maple trees. He ended up with 16 gallons of syrup. About how may sugar maple trees does he need?
ans: 25 gallons = 100 trees1 gallon = 10025 = 4 trees16 gallons = 4 x 16 = 64 maple trees. B) A 5 minute shower requires about 18 gallons of water. About how much water do you use for an 8 minute shower? How much water will you use if you take an 8 minute shower every day of the year?ans: 5 minutes = 18 gallons1 minute = 185 = 38 minute = 185 x 8 = 28.8 gallons28.8 x 365 = 10512 gallons a year C) A double spaced page of text contains about 250 words if it is printed in Times with a font size of 12, and about 330 words if it is printed in Times with the font size of 10. Jeremy printed his term paper in the computer lab. He used 10 - point Times and the paper came to 15 double spaced pages. Jeremy's teacher requires term papers be 20 double spaced pages long. If Jeremy changes the font to the 12 - point Times, how long will his paper be? ans: 10 points - 15 double spaced1 - point 15 310 = 212 - points 1510 x 12 = 18 double spaced D) Jogging burns 100 per mile. Elizabeth jogs at a rate of 4.5 miles per hour. How long will it take her to burn 1200 - calorie lunch she ate at Burger Heaven?
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ans: 1 mile - 100 calories4.5 - 100 x 4.5 = 450450 - 4.54501200 - 4.5450x 1200 = 12 miles 6.2 Follow Up Ask adults you know if they use rules of thumb in their jobs or at home. Write down one of the rules you learn. Write a problem that can be solved using the rule. ans: Since 2 quarts are 4 pints of milk. Then how many is 1 quart? 2 quarts - 4 pint1 quarts - 42 = 2
A) It takes about 100 maple trees to make 25 gallons of maple syrup. Mr. Paulo made maple syrup from all of his sugar maple trees. He ended up with 16 gallons of syrup. About how may sugar maple trees does he need?
ans: 25 gallons = 100 trees1 gallon = 10025 = 4 trees16 gallons = 4 x 16 = 64 maple trees.
B) A 5 minute shower requires about 18 gallons of water. About how much water do you use for an 8 minute shower? How much water will you use if you take an 8 minute shower every day of the year?
C) A double spaced page of text contains about 250 words if it is printed in Times with a font size of 12, and about 330 words if it is printed in Times with the font size of 10. Jeremy printed his term paper in the computer lab. He used 10 - point Times and the paper came to 15 double spaced pages. Jeremy's teacher requires term papers be 20 double spaced pages long. If Jeremy changes the font to the 12 - point Times, how long will his paper be?
ans: 10 points - 15 double spaced1 - point 15 310 = 212 - points 1510 x 12 = 18 double spaced
D) Jogging burns 100 per mile. Elizabeth jogs at a rate of 4.5 miles per hour. How long will it take her to burn 1200 - calorie lunch she ate at Burger Heaven?
ans: 1 mile - 100 calories4.5 - 100 x 4.5 = 450450 - 4.54501200 - 4.5450x 1200 = 12 miles
6.2 Follow Up
Ask adults you know if they use rules of thumb in their jobs or at home. Write down one of the rules you learn. Write a problem that can be solved using the rule.
ans: Since 2 quarts are 4 pints of milk. Then how many is 1 quart?
2 quarts - 4 pint1 quarts - 42 = 2